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Method and apparatus for obtaining TD-SCDMA system noise power, signal-noise ratio and signal-interference ratio

A TD-SCDMA, noise power technology, used in power management, transmission systems, wireless communications, etc., can solve the problems of inaccurate estimation of noise power, signal-to-noise ratio and signal-to-interference ratio, and inability to adapt to complex and changeable wireless channel environments.

Active Publication Date: 2012-12-26
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the problems existing in the existing methods of obtaining noise power, signal-to-noise ratio and signal-to-interference ratio that cannot adapt to complex and changeable wireless channel environments, resulting in inaccurate estimation of noise power, signal-to-noise ratio and signal-to-interference ratio, the present invention proposes A TD-SCDMA system noise power, signal-to-noise ratio and signal-to-interference ratio acquisition method and device

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  • Method and apparatus for obtaining TD-SCDMA system noise power, signal-noise ratio and signal-interference ratio
  • Method and apparatus for obtaining TD-SCDMA system noise power, signal-noise ratio and signal-interference ratio
  • Method and apparatus for obtaining TD-SCDMA system noise power, signal-noise ratio and signal-interference ratio

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specific Embodiment 1

[0152] Specific embodiment 1: An embodiment of obtaining noise power when the base station side does not use SCTD antenna diversity

[0153] After the system has achieved chip-level precise synchronization, start to obtain the noise power:

[0154] A, obtain the optimal automatic gain control (abbreviated as AGC) value AGC_noise (dB) of current received data, in the present embodiment, AGC_noise (dB)=0dB

[0155] B. Intercept the midamble data corresponding to the TS0 time slot in the last subframe of the main load, and use the Steiner estimator to perform channel estimation;

[0156] C, select the noise tap, and superpose and accumulate the noise power in the variable NoisePwr_temp (initial value is 0), and record the number of noise taps Noise_num (initial value is 0);

[0157] In this embodiment, the base station side does not use space code transmit diversity (abbreviated as SCTD) to transmit data, so the second channel estimation window (midamble shift component m (2) C...

specific Embodiment 2

[0167] Specific embodiment 2: an embodiment of obtaining noise power when the base station side uses SCTD antenna diversity

[0168] After the system has achieved chip-level precise synchronization, start to obtain the noise power:

[0169] A, obtain the optimal automatic gain control (abbreviated as AGC) value AGC_noise (dB) of current received data, in the present embodiment, AGC_noise (dB)=0dB

[0170] B. Intercept the midamble data corresponding to the TS0 time slot in the last subframe of the main load, and use the Steiner estimator to perform channel estimation;

[0171]C, select the noise tap, and superpose and accumulate the noise power in the variable NoisePwr_temp (initial value is 0), and record the number of noise taps Noise_num (initial value is 0);

[0172] In this embodiment, the base station side uses space code transmit diversity (SCTD for short) to send data, and the taps whose power in each window is lower than the channel estimated peak power × 0.5 and are...

specific Embodiment 3

[0179] Specific embodiment 3: TD-SCDMA system signal-to-interference ratio acquisition method of the present invention When midamble distribution mode is Default or UE specification, the acquisition steps of signal-to-interference ratio:

[0180] A. Use the noise power acquisition method of the present invention to obtain noise power NoisePwr and corresponding AGC_noise;

[0181] B, obtain the preferred AGC gain value AGC_signal (dB) of receiving time slot;

[0182] C. Receive a frame of midamble data of a single time slot where the target user is located, and use a Steiner estimator to perform channel estimation;

[0183] D. Repeat the above steps for a predetermined number of f_num frames, and superimpose and accumulate the estimated channel power of each frame in CIRPwr (initial value is an array of all 0s), the predetermined number f_num of this embodiment takes a value of 5;

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Abstract

The invention provides a method and device for obtaining noise power, signal-to-noise ratio and signal to interference ratio of a TD-SCDMA system, which is provided for solving the problems that the method of the existing art for obtaining noise power, signal-to-noise ratio and signal to interference ratio can not be applied in complicated wireless channel environment, and the estimation of noise power, signal-to-noise ratio and signal to interference ratio are led to be inaccurate. The method and device for obtaining noise power, signal-to-noise ratio and signal to interference ratio of the invention comprises utilizing an ascertained noise tapping head with higher reliability in TSO time slot channel to correct with efficiency power to obtain noise power, and only renewing in preset time according to the stability character of environment noise power, avoiding the problem that bigger calculating amount is brought by long-term and continuous obtaining. The method and device for obtaining noise power, signal-to-noise ratio and signal to interference ratio of the invention can accurately, timely and reliably obtain noise power, signal-to-noise ratio and signal to interference ratio under the circumstance that channel environment is extremely bad.

Description

field of invention [0001] The present invention relates to a method and device for obtaining noise power, signal-to-noise ratio and signal-to-interference ratio of a wireless communication system, and in particular to a method and device for obtaining noise power, signal-to-noise ratio and signal-to-interference ratio of a time division-synchronous code division multiple access wireless communication system. device. Background technique [0002] The time division-synchronous code division multiple access wireless communication system (abbreviated as TD-SCDMA system) is a third-generation mobile communication system standard proposed by China and accepted by the International Telecommunications Union (abbreviated as ITU). The TD-SCDMA system comprehensively uses three multiple access technologies of TDMA, FDMA and CDMA to improve the system capacity. However, due to the complexity of the wireless transmission environment, when the information data of different users are modu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W52/24H04B17/00H04B17/336
CPCY02B60/50
Inventor 谭舒申敏王茜竹郑建宏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD